Best cooling fan for Raptor 50/OS 50-H?

[Rodan]

I've got a Raptor 50/ OS 50-H in a TT MD530, and I'd like to upgrade from the stock fan to something that will pull more air through for cooling.

So, what's the best?

I've heard good things about Quick UK... any other contenders?

[Funky]

I really like the Kasama fan. Its a little cheaper than the QuickUK fan. I had to replace my fan after breaking my clutch bolts. My clutch beat up the end of my stock fan so I picked this one up.

http://www.helifreak.com/album_mod/upload/8cca0643d0d0c101bc7648416d7b77f0.jpg

http://www.helifreak.com/album_mod/upload/2e63a9ded2b18a0015124d5b0a900029.jpg